Clear answer
Strength practice generally uses a relatively challenging contraction, endurance practice uses an effort that can be sustained without fading, and control practice often uses lower, graded efforts that make direction and release clear. These are principles, not universal percentages. The correct effort is the highest level that still serves the intended quality without breath-holding, bearing down, substitution, incomplete release, or symptom worsening.
An app’s effort percentage is a coaching cue, not measured force. If a clinician has assessed you and prescribed an effort, follow that plan.
Effort depends on the quality
The ICS assessment terminology distinguishes strength, endurance, power, relaxation, and coordination. A single “medium Kegel” cannot train all of them equally.
Strength
Strength work aims to produce substantial force for a controlled repetition. Effort may be high relative to current ability, but the contraction must still travel inward, allow breathing, and end fully. Stop when force or direction clearly falls.
Endurance
Endurance work aims to sustain appropriate activity. The initial effort must leave enough capacity to maintain it. A lower but stable contraction is usually more specific than a maximal start followed by rapid fading and whole-body bracing.
Control and awareness
Control work may ask for gentle, moderate, and stronger contractions or precise on–off timing. Lower effort helps reduce substitution and makes the resting state easier to recognize. Progress is better grading, not merely more force.
Quick response
Quick contractions require prompt activation and prompt release. Excessive effort can slow the off phase. Use an effort that produces distinct pulses without merging.
Relaxation
Relaxation is not a zero-effort version of strengthening; it may be the primary training goal. For pain or nonrelaxation, contractions may stay gentle or be omitted under clinician guidance.
Perceived percentages are not measurements
A cue such as 50% effort means “about half of what feels like your current maximum.” It does not mean the pelvic floor is producing half of a measured force. Perception changes with position, fatigue, symptoms, and attention.
Use percentages to create contrast among tasks, not to compare yourself with another person or prove progress. A device also does not automatically measure the clinically relevant force or direction unless its method and interpretation fit the question.
Find the usable effort ceiling
Begin gently and increase only while:
- direction remains closing and inward;
- the ribs and abdomen can move with breathing;
- the buttocks and thighs do not become the main action;
- the contraction can end completely;
- the next repetition begins from rest;
- symptoms remain stable.
The last level that preserves these markers is your self-guided ceiling for that task. It is not a diagnosis or permanent score.
Effort changes with position and fatigue
The effort that works lying down may be too high standing. Later repetitions may require the same intent but produce less output. Do not compensate by bracing harder. End the set, add recovery, or reduce the programmed demand.
When changing position, hold effort and volume steady or reduce them. Re-establish technique before progressing again.
Common mistakes
- using maximum effort for every quality;
- calling breath-holding a stronger contraction;
- lowering effort during a hold without recognizing that the task changed;
- keeping low-level tension between repetitions;
- increasing effort and volume together;
- treating pain or pressure as evidence of an effective workout.
Evidence boundaries
Bø and colleagues discuss pelvic-floor exercise-science principles and commonly used strength ranges. The International Consultation on Incontinence recognizes multiple training qualities. NICE recommends tailoring PFMT to ability, discomfort, needs, and goals. These sources do not establish one perceived-effort percentage for every adult or condition.
Many clinical trials do not isolate effort from supervision, technique, volume, and progression. The best effort for an individual cannot be inferred from a generic study protocol alone.
Safety and scope
Stop for pain, pressure, heaviness, worsening urgency or leakage, persistent tightness, or difficulty passing urine or stool. Recent surgery, pregnancy complications, active cancer treatment, neurological symptoms, and clinician-prescribed rehabilitation require individual guidance.
Seek urgent care for sudden inability to urinate or new saddle-area numbness with acute bladder, bowel, or leg changes.
Related next steps
Review how hard to squeeze, the five pelvic-floor training qualities, and strength versus endurance sequencing.
Effort should leave room for the rest of the repetition
A contraction is not successful merely because its peak feels strong. The person must still maintain or modulate it as intended, stop it on purpose, and recover before the next effort. Choose an intensity that leaves enough control for every phase.
For strength, this may mean a strong but brief quality-limited effort with generous recovery. For endurance, it means selecting an effort low enough to preserve useful force. For control, it means enough sensation to distinguish levels without turning every level into a maximum.
Use the talk-and-release check
During a learning repetition, confirm that you can continue a quiet breath or short phrase. Afterward, confirm that the pelvic area, abdomen, buttocks, and jaw can soften. These checks do not measure force, but failure indicates that the chosen effort may be too high for self-guided practice.
Do not deliberately hyperventilate or extend exhalation. Ordinary breathing is the target.
Effort after a break or symptom change
Return below the previous training intensity after illness, a long break, or a change in symptoms. Re-establish direction and release before rebuilding. Capacity remembered from an earlier week is not evidence of current readiness.
If a low effort repeatedly triggers pain, pressure, urgency, or emptying change, the decision is not between moderate and strong. Pause and seek assessment of the goal and symptom.
Separate perceived effort from symptom intensity
A contraction that feels difficult is not necessarily a better training stimulus, and a strong symptom sensation is not evidence of strong muscle work. Rate the intended pelvic-floor effort separately from pain, pressure, urgency, heaviness, and whole-body exertion.
If symptom intensity rises while pelvic-floor direction becomes less clear, stop. Do not count the discomfort as part of the desired effort.
Clinician measurement does not create a permanent number
Even when force is assessed clinically, the appropriate training intensity can change with position, fatigue, recovery, symptoms, and programme phase. Ask how the prescribed effort should feel, what substitutions to watch for, and how it will be progressed.
A device or examination can support decisions but cannot remove the need for full release, symptom monitoring, and informed consent.
Choose reproducibility over impressive effort. A level that can be described, released, and repeated is more useful than a maximum that changes the movement.
Sources
- Bø K, Berghmans B, Mørkved S, Van Kampen M, editors. Evidence-Based Physical Therapy for the Pelvic Floor. 3rd edition. Elsevier; 2023. Chapter 6. Official publisher record.
- Frawley H, Shelly B, Morin M, et al. “An International Continence Society report on the terminology for pelvic floor muscle assessment.” Neurourology and Urodynamics. 2021;40(5):1217–1260. Official ICS report.
- Cardozo L, Rovner E, Wagg A, Wein A, Abrams P, editors. Incontinence. 7th edition. ICI–ICS; 2023. Chapter 8. Official ICS edition.
- National Institute for Health and Care Excellence. Pelvic floor dysfunction: prevention and non-surgical management. NICE guideline NG210. NICE recommendations.